Up to you, mate. You've had it a while and every time I look at it now I get this subliminal thought that this is what you look like - all 1972 'big fan of Atomic Rooster' but 'listen to them mostly in my bedroom'....and I start thinking 'are you wearing a tank top and cowpat shoes?' Likewise...
Of all the persons to start a critique of avatars .....*
Back to the OP post - I presume the comment refers to the age of the photo. Judging by the hairstyles, and the very characteristic 'jumper' on the ginger lad, I would say 1971. The subliminal message being 'read the Argus and transport...