When I was 13, which was 1985, my school friends and I were obsessed with the 1950s actor James Dean. I had my bedroom walls covered with posters of him, wore a baseball jacket like he wore, read books about his life etc, although strangely I never watched any of his films as they weren't on telly! I remember thinking about him and crying on September 30 1985 which would have been the 30th anniversary of his death.
This made me think. The equivalent today would be my granddaughter (16) having an obsession with Kurt Cobain who has been dead 30 years this year. This really has shook me because I remember Kurt dying so clearly (loved Nirvana) but in the 80s it seemed like the 50s were impossibly long ago, the dim and distant past surely? And this has made me feel so old. 
Also, this means that next year - 2025 - will be the 70th anniversary of James Dean's death. I might light a candle on September 30th and shed a little tear in remembrance of him and my own youth.