Not at all. I think it is very responsible to start them at this age.
We have a rule that all toys need to be tidied for meals. This way there is an incentive as well.
However I have made things non confusing for them at this age too. Rather than saying clean your room which is so broad?!
I have photos and words on their clothes draws so they know where to put things away.
And tubs with the same for each toy style or set. It sets a clear expectation and also they know they cant say but I don't know where it does as it is all black and white for them until they are older and can make their own decisions on where things bellong

Also if they ask for an activities which is restricted ( ie supervised only such as painting or computer games ) they must clean up the previous activity first, they catch on pretty quick with routine. Just say it once maybe twice and eventually even if that may mean an hour of whining it will be done as they will realise the reward eventually