Frenectomy. It is possible to get your tongue clipped-- a frenulectomy---at any age. A soft tissue laser can fix the lack of mobility very quickly when used properly. Visit your dentist for a referral if you want to have it done.
Yes. For adults that are "tongue tied" a simple surgical clipping of the frenum can be done to allow the tongue to protrude.
Lingual Frenectomy. Or frenuloplasty can be performed at ay age, although when there is an excessively thick or anteriorly positioned attachment, this is usually dealt with in childhood. I do occasionally have adult patients who seek treatment for various reasons.
Yes. In certain cases, this is done.