How to feel old: check out these albums that you won't believe turn 20 in 2015.

Depending on your age, some of these were a big part of your growing up---or they at least registered on your music meter at some point, even if you didn't really connect with all of them on any deep level (you still probably recognize most or all of them).

Here's the list from diffuser.fm (read it and weep):

The Smashing Pumpkins, 'Mellon Collie and the Infinite Sadness'

The 'Batman Forever' soundtrack (which includes U2's 'Hold Me, Thrill Me, Kiss Me, Kill Me'

311's self-titled album

Bjork, 'Post'

Deftones, 'Adrenaline'

Foo Fighters' self-titled debut album

Green Day, 'Insomniac'

Jawbreaker, 'Dear You'

Alanis Morissette, 'Jagged Little Pill'

No Doubt, 'Tragic Kingdom'

[Oasis, '(What's the Story) Morning Glory?'

Radiohead, 'The Bends'

Rancid, '...And Out Come the Wolves'

Red Hot Chili Peppers, 'One Hot Minute'

Silverchair, 'Frogstomp'

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