Cheers.
To expand, matching name/service number, I have a marriage certificate in 1952 saying he's 33, so I thought he'd be born 1918/1919... and now I've spotted a record (not seen it yet/Forces War Records site) with the date of 1925, so now I'm thinking "He lied about his age when he married!", so trying to guess a different year of birth at the moment
15 in 1925 is closer to YoB 1910, which would mean a bride of 27 thinking she was marrying a 33 year old chap was actually getting hitched to somebody aged about 42. This is a "new to me today" new thought and unexpected twist.
The "age a lad could be" would be giving me a guess at his possible YoB.
Leading on from that ... if I do discover an earlier YoB than expected... it opens up a whole new possibility that he might've even had a "first wife".... all new thoughts added today....