It increase slightly,but also the recommendation is more accurate. You also get more youths per week the higher you go. The younger talent thing is a vaguely long story,but basically: every youth you pulled use to be a 'younger talent' at age 16ish. TM decided to improve this as they said it was boring it took two seasons before you could sell,and longer still before they're first team ready. Their solution was to make youth pulls 18 instead of 16,they said the players
would still work out to be just as good. Some people didn't understand this and kept moaning how their youths wouldn't be as good anymore. so TM in a bit of a smartass move,made the option younger youth pulls costing pro days. If you believe TM,there is no advantage
To pulling younger guys,except maybe a couple of years extra in their career.