That happens Gregimotis, I'm getting back into it for more the physical training than the competition, most fighters are past their prime by 25, my son who is devilish quick and can still hold his own would not be good enough to enter the Shoto Cup or other such international event.
I find as I age the balance I had when I was training is slipping from me, I first noticed it when I started riding motorbikes again, just seemed to have lost that edge and as they say "use it or lose it"!
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Jesus freak, there is no better family bonding thing than martial arts, both my kids did it and my daughter was green belt ( 6th Kyu) when she went to a major city on her own to attend university.
It held her in good stead as not only does it teach you to defend yourself it also teaches you how to avoid the confrontation in the first place, well JKA/Shotokan does anyway.
My son my ex wife and myself all trained and competed as a family for many years (in fact my ex ran off with our Karate instructor of 2 decades but that's another story altogether
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) My suggestion, find a good (not egotistical or cruel, watch how he treats the kids in his class) instructor and enrol, it's usually cheaper than the gym and works more muscles as well as teaching some vital and useful skills.