The amount of RAM you are using depends a lot on the OS/version and the software and what exactly you are doing. My son and daughter both tinkered around with animation and large Photoshop and Adobe files. That kind of activity, especially animation requires powerful processor and lots of RAM. If you are going to put this on Windows 7 64 bit then don't use the Home version. Use a better version that can use more RAM. Try looking at this website:
https://msdn.microsoft.com/en-us/li...=vs.85).aspx#physical_memory_limits_windows_7
Win 7 64 home premium has lower limit of 16gb.
Win 7 64 Professional has a high limit of 192gb.
Your motherboard has to support higher RAM usage also.
For instance I suggest an X99 chipset motherboard which has 4 RAM slots and supports quad channel RAM usage and higher MAX RAM usage limits. Unfortunately to get to this level of quality and capacity, the motherboard typically costs about $200+. Normally this is reserved for a workstation build or high end power users.