My last Season Ticket as a Junior (under 18 I think) was in 1976 and it cost £4.50, still got the receipt and the leather City embossed holder, can’t get a pint for that price these days.IIRC it was 2 shillings (10p in today's currency) back in the 1960's. Even cheaper in the scoreboard end.
The good news is I qualify for the FOC season ticket next season, think my Colin Bell Level 2 padded comfy (not the comfy chair) seat will be around £500 next season, bargain, but those bastards in Office are making me wait another year for my bus pass.