Salah has longevity to his career. He has quick feet and close ball control and strength much like Suarez and Messi, not that I think he is as good as either in their prime.
He is pacey out the blocks, but I wouldn't say he is fast, a lot of fast full backs will out run him, so I don't see a loss of pace being a factor.
I do see a loss of pace affecting him. It's still a crucial asset.
I'd hope at least 2-3 more years in him before it starts to take hold.
You might say pace doesn't affect Bobby either but it really does. He looks a yard slower now and it does impact just getting on the ball.