Based on what you have said, I can't be other than happy with the Novice category. It represents everything that I wanted: preferably same age pairs (within a range but still, we can assume that kids within a 2 year gap can communicate like they are the same age),
The current ISU Novice age rules:
i) Basic Novice - has not reached the age of thirteen (13).
ii) Intermediate Novice - has not reached the age of fifteen (15).
iii) Advanced Novice - has reached the age of ten (10) and has not reached the age of fifteen (15) for girls (Singles/Pair Skating/Ice Dance) and boys (Single Skating) and seventeen (17) for boys (Pair Skating/Ice Dance).
I.e., there is no minimum age for Basic Novice and Intermediate Novice. Pairs doesn't have an Intermediate Novice category, probably because there just aren't enough pairs to begin with to justify it.
The minimum age for Advanced Novice is 10, and the maximum age for male pair skaters is 16 (as of July 1, might turn 17 during the season).
So it's entirely possible for pairs to form with age differences up to 6 years at these levels.
It's unlikely that pairs would form with those large age differences and even less likely that they would stay together long, because the wider the age difference, the more they will run into years when they are not both age-eligible for the same competition level.
But with the 10-14/16 age range for Advanced Novice and the 13-18/20 age range for Junior, teams with age differences of 2, 3, or 4 years are able to stay together and continue competing together for several years in each of these categories, assuming they are still well matched athletically and still want to compete together.
As kids begin to grow, one partner might outgrow the other so that they become less well matched physically. Sometimes they stick it out together and accept lesser results for a year or two as the skater who grew adjusts to their new body and the team waits for the other skater to also grow and catch up. Other times they decide to take a break or to look for different partners. That can happen even the partners are very close in age. Even if you have boy/girl twins skating together, there might be a period where the girl is taller than the boy. That's not always a problem in ice dance, but it could be a significant issue for intermediate or advanced novice pairs, where their skill development is starting to work on beginning and then intermediate-difficulty overhead lifts.
Overlaps between the age eligibility ranges for the various levels allows young teams that are just starting together in pair skating to start at the level appropriate to their skill level and competitive goals.
Say you have a Pair A consisting of a 13-year-old girl and 14-year-old boy who decide to team up. If their basic skating ability as individual skaters is not yet at an "intermediate novice" level and/or they don't have much size difference or upper body strength, they would not be able to compete in Basic Novice because they're too old.
They could do Advanced Novice, with only Group 1 and 2 (non-overhead) lifts and single twists, but would not be competitive at that level at first. They would still be eligible to stay at Advanced Novice level for a second season, during which their basic skating should improve and they might become ready to attempt Group 3 and 4 lifts and double twists. With a younger girl (larger age range), they could stay in Advanced Novice for more years.
Pair B, also 13 and 14, might already be fast strong skaters with double axels. But they decide to focus on pairs. They might be ready to try those Group 3 and 4 lifts and double twists their first year together, assuming they have sufficient size difference.
Pair C, same ages, might have already skated together in Basic Novice pairs and last year in Advanced Novice pairs already. If he's a strong lifter and she's naturally petite, they may already have some of those skills in their repertoire and could do well in Advanced Novice this year.
If they already have all those skills and are ready to try a beginning Group 5 lift (probably 5S or 5T, without many level features), by 13 and 14 they might even be ready to move up to juniors.
Same-aged teams, different skill levels. That's the advantage of the overlaps between the different skill levels.
Here, by the way, is an example of an 11- and 12-year-old team from pre-IJS era who already had Group 4 lift (with one-arm hold) and double twist:
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On the other hand, if the tiny number of available potential pair skaters, of both sexes, in a given small country or local region of a larger country might mean that the options are either form a pair with larger age gap or don't form any pairs at all.
Maybe you have a brother and sister 3 or 4 years apart in age who want to skate pairs together.
Here's an even earlier pre-IJS pair competing juniors with a double twist and beginning 5A lift at ages just-14 and almost-18:
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They competed together for many many years, as Australian national champions from 1981 through 1999. Most of those years there were no other pairs in in Australia. Under your proposal, there would have been zero pairs in Australia for most of those years.
Not to mention this 13- and almost-18-year-old junior world pair champs:
https://www.youtube.com/watch?v=OjYR2VggMvU
Under 2026 age rules, they would still have been junior three years later (when they won the 1988 Olympics in real life). But should they really not have been allowed even to team up until 1989, her first year of senior eligibility and his first year of not being junior eligible?