Someone once said- its not the number of years in my life that are important, its the life in those years. Couldn't have said it better myself.
It doesn't matter if you are 20years old or 30 as long as you wake up each morning looking forward to the day. A decade long relationship is worth holding close only if both of you still pine for each other and can't imagine a life without, else its just a habit. Friendships may be 20years old or just a few days, if they warm your heart, they're worth investing in.
Don't live your life by numbers. Take each day as a new one. And try to fill your years with life and your life with love. Not because you're expected to or have to or must. But because you want to.