Lukaku can adapt. He might not be the fastest guy on the pitch anymore, but he's got the smarts, the positioning, the finishing touch. He is indeed aging. Yet, that also makes him wiser and more cool under pressure. When the game hangs on, you want a player like that on your squad. Never undervalue the authority of experience. Lukaku has still more to contribute
Lukaku always get problems with his speed and he failed in Premier League at big clubs because of his slow speed but he has other things that can help him to score goals and help his clubs winning matches. So it's up to the club and head coach to use Lukaku in a way that can maximize his strength while can cover his weakness as best as possible.His body is no longer as same as years ago when he was younger and stronger, but with older age, he has more experience and better ability to shot coldly under pressure. These things from years of playing can help him and his clubs too.
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What a belly (just joking, no sarcasm) 
His belly looks better than Sule's belly.https://www.reddit.com/r/BayernMunich/comments/1cub1mc/sule/
