That hair looks a lot like the base game short combed hair, wihch is available child - elder.
Melodie9 adapted it for use by toddlers, too.
This Peggy pay hair might also be a good option, though it's not slicked like what you would expect from male hair in the 1960s.
Raon 8 might be another option, though it's not really slicked back, either, but is a similar cut with a more flopped down fringe.