During the 60's I let my hair grow long (it was the in thing pretty much) and it stayed that way for many years.
My old man used to embarrass me about it. He was a World War Two infantry man in the Eighth Army and having crossed North Africa, gone up through Sicily and Italy he was wounded out as they moved North when Monte Cassini fell.
.... and the way he embarrassed me ? ...... He let his hair grow even longer !! (He was a bit mad, but being married to a mad Irish woman does that I think
)