Claiming experience in the kink lifestyle from "early teens" to me is the issue. I'm not going to say its impossible but definitely improbable. No one in the lifestyle is going to allow someone under 18 to participate with them, nor attend munches, meets, or mentor that underage person (several dungeons are even 21 and up only) If someone in fact did participate with someone underage then they should have been jailed. Where as I don't think age necessarily relates to experience, at the age of "early teens" one is hardly in a position to be managing someone else as they are still living at home as a dependent of some sort of parental/ custodial guardian. Experience does not consist of I had rough sex , i told a girl what to do on skyep/kik/etc, or I watched bdsm porn.
So, does you being 25 matter? Well no not really . I have come across several men and women on both sides of the slash who were 19-21 and were better educated and versed in bdsm/ kink life well beyond others who had been at it for many years. The thing was those people started at 18. They researched, they attended local munches meets and spectated on dungeon 101 nights. They learned with a mentor and were oversighted by a mentor until such time they could safely do it on their own. That being said I have talked to countless people of all ages 30s-80s and they weren't necessarily any better. Age means more life experience but not necessarily "lifestyle" exp.
So when considering someone, I myself don't focus on the age aspect. I focus on the active years of BDSM/ kink experience. And when I say experience I mean actively participating. They should have detailed examples and be able to respond with specifics when we talk. Not just "I got lots of exp" Saying "I've been in this lifestyle for X amount of years" means nothing unless you know what that person really actively did.
The other issue is due to this stereotype of age = exp. New subs are more likely to trust older doms just because. That also works in opposite. Several guys seek out a new younger girl much younger than themselves in the hopes that they can take advantage of that lack of exp. Where as an experienced sub would see through the doms bullshit almost immediately and call him on it. Just browse some of the many posts here youll see it.