Sorry to say I do not and never have followed this rule or guide line. If it wasn’t because my house burned 3yrs ago I would still be using my mom had from the 80s and let me tell you it lasted and looked better than some of my new stuff.
After the fire, I restocked my make-up bag and yes, I still have stuff that is 3+ years old. My rule of thumb is if I’m not getting any allergic reaction and it still looks good and isn’t irritating my skin I’m not tossing it out. Nevertheless, I will say this, I do know when it’s time to let make up go and buy new supplies.
My mascara was getting dry and clumpy so I went out to my local CVS and of course looked for what was on sale. Turns out Cover Girl Lash Blast Waterproof Mascara - Very Black $6.99: was on sale for a $1 off so I picked it up. Well I must say that I love it! The bristles on the wand are small for optimal coverage and indeed elongate the lashes. My favorite part is that it doesn’t clump and it doesn’t give you raccoon eyes the next morning.