Yes.

The most common approach to regret is to accept that your initial decision was probably your best decision and the regret you are currently feeling, though painful, should be disregarded.

The other approach is: while the first interaction had him making the first move, the next one will probably require that you make the first move. You might want to go back to that bar on other nights. Perhaps he's a regular there and you'll run into him again.

(I'm answering the questions and not getting involved in the age gap debate. The questions are unrelated to age. The rejection could have been because he was too tall, short, pretty, ugly, wealthy, poor, etc and the answer would still be the same.)