Stardew Valley is a timeless game because if you get bored of the endless existing content, you can simply install mods to expand your gameplay. If there is an update and you are worried that your mods are outdated, I will explain below how to update your mods in Stardew Valley.
How to prepare your mods for Stardew Valley 1.6
If you're concerned about the compatibility of your Stardew Valley mods with version 1.6 or another version, most mods have been updated so that you can re-download and use them. However, some will likely remain outdated. As such, I highly recommend saving your current game and mod files for safekeeping.
You can start by duplicating the Stardew Valley game folder to another location and renaming it. This way, when you want to play with those specific mods, you can use the Stardew Valley version downgrading tool. The Stardew Valley folder is located in:
You can simply use the version downgrade tool to launch the folder you just duplicated, and then you can play any version of the game you want.