Although I understand the sentiment, some 15 year olds really are just little girls and it's odd to call such children seniors. And, indeed, I don't like Figure Skating turning into jump skating either. Impressive as the jumps might be (and they are). I didn't stop watching certain gymnastic sports for nothing. I remember being rather pleased at the time when they upped the age to 15. The first time I saw Michelle Kwan at a Worlds I think she was 13, and never expected her to become the long-time success she eventually became. But I also found it ridiculous to see such a young girl in the mix.
But stating that the young guns don't put any time in the sport looks rather unfair to me. I think these girls work real hard, have done so for years, and I'm hoping they will improve on the other aspect of the sport, the skating skills and the gracefulness in time. Actually, some already have the complete package. Big jumps and beautiful skating, and managing to turn out appealing skates with lovely movements, a fluid crossing over the ice and all those things. Walking off with the medals, yes, but they worked for those, and used their talents well.
It's something else if you're talking about longevity in the sport. I personally like to follow skaters and root for them during a longer period of time, have a soft spot for veterans in the sport - be they male or female. It's not as if the young guns take the pleasure away from watching the others. Frustrating maybe that there isn't a special skater with medals to root for during a longer period of time, because there's a new star every year. Upping the age limit won't change this evolution when there's such a deep field of talented skaters. Having said that, Zagitova is still around, isn't she? Even won the WC a year after her Olympic gold.
i would much prefer to bring back the PCS marks to what they are intended to do than upping the age minimum. Perhaps change the factor used, and also not increasing them when there are bigger jumps. There's Base Values and GOE to take account of the jumps (and spins and steps). And not 'punish' girls and boys by keeping them among juniors too long if they have achieved all they can there already. We might miss out on them altogether among the seniors, and that would be a shame.