That's an interesting observation - not denying it but it's interesting.
I'm a bit younger (couldn't vote until '92) but my perception - a bit later, more like late 80s and early 90s - was that the Tories had a lot of appeal for those of about 30 or 35 upwards, so relatively young, but weren't popular amongst the late-teens and twentysomethings.
One also gets the impression that a lot of young people of the early-mid 80s (student age, twentysomethings) were left-leaning, being sympathetic to the striking miners, CND, and so on. But as someone comfortably below voting age at this time, I can't really speak first hand - my opinions are probably shaped by popular culture rather than personal experience, as I didn't know any twentysomethings personally in let's say 1985.
Presumably though the Cameron Tories must have had a fair amount of appeal to the relatively young (30-somethings in 2010) who wouldn't be as old as all that now.
What's odd is that the Reform, a party with very antiquated views IMO (far more than the Tories) can appeal to young people. Farage acts like he was born in 1864, not 1964, and If the Tories are stuck in the 1980s, Reform are stuck in the 1880s!