Opt for a more reasonable game
If you're a competitor, the evidence shows you always will be. You'll still be hungry for success on the pitch even with a few more years on the clock. You'll want to win, but perhaps less fervently than before. What changes is that, as a veteran, you might be less able to perform certain techniques, and you might injure yourself.
On the other hand, you're less likely to make silly mistakes. The game should be much more friendly, so you'll have to stay reasonable if you were once used to powerful tackles!
From a technical and tactical point of view, a veteran should rely on their experience and planning ahead rather than on their speed.