Take photos of everyone in your life. Do it as often as you can. Every day even. Capture the funny way they close their eyes when they smile and how they shake their head when they make jokes. Take photos. Take videos too. Record happy little conversations about nothing. You will want to look at these memories later. No many how many you take you will always kick yourself for not having enough. One day these easy moments will be gone and so will the people you shared them with.
Over time the details fade. You can only remember the feelings you shared with the old friends. The way their voice sounds gets muddled and lost. It hurts to lose this. Do everything you can so that you do not.