depends on how much money you are okay with spending to replenish your 250 tokens. The "teach a man to fish" answer is, do a cost-benefit analysis. Look at what other options you have to spend your 250 tokens. Make a few options how to spend it and then select the one you think is best. It could be boosting your 28 year old player 20%, it could be spend in academy to train a new replacement. Without knowing anything about your team, I would only do it if this player is very instrumental to the performance of your team.