My dad is bald and is 60? Can he microneedle?

Asking on behalf of my dad. He’s 61, and I just started microneedling and telling him about it. All he has is his sides and I’ve remembered him like that for as long as I can remember (I’m 24) He seems interested in trying it and I’m letting him borrow my pen. Is there any chance of anything happening. He seems quietly interested in it, so much so that he’s wanting to try it tomorrow. But I don’t want him getting hopes up if that’s something that’s too far gone. Can follicles be dormant for so long that they just can’t be revitalized?

I would imagine that microneedling in a person who has been bald for 20 years would not produce growth because these hairs went through apoptosis (cell death) years ago and probably the hair can’t be brought back.