Gracie is 3 years and 4 and half months elder than Elena R.Also as someone mentioned, Gracie was 8 when she started skating, most skaters who wind up competing at the elite level start at a much younger age, so when you think of it that way, although Gracie is 4 years older than Elena Radionova, they actually began skating at the same time/have been skating the same number of years (9-10)
It may mean not so much.
Serafima Sakhanovch, who is 1 year and 1 month younger than Elena R., started skating at 7. Now she is about the same level as Elena R. a season before (i.e. at same age).
Sakhanovch landed in competition non-URed combo 3S+3T+3T being 12 years and 2 months old (after about 5 years of skating).
Progress of skating is very individual.