I think the first was the 1964 GE, I'd just started Primary school.
At age 4 I didn't understand what was going on but I remember the blue posters with a white cross and I think somebody explained the name Hiley across them was a candidate. Also remember the Labour chap knocking on our door and he'd been at school with my Mum.
1970 was the first one I understood what it was actually about and the names Wilson and Heath.