See if you can find a picture of him aged 29.
Probably, without having any other photos to go on.
More likely to continue losing over time. If you look at any male celeb they generally have less hair aged 60 than they did at 50.
Hard one because as well as a receeding hairline he probably lost density as well. 10,000 follicles?
Maybe 2,500-3,000 to get the NW2 'shape'. Depends on density requirements.
It's quite good actually.