At what age should this be started?
How to go about it such that the child doesn't feel bored?
Parenting Stack Exchange is a question and answer site for parents, grandparents, nannies and others with a parenting role. It only takes a minute to sign up.
Sign up to join this communityAt what age should this be started?
How to go about it such that the child doesn't feel bored?
From toddlerhood onwards.
Do it together - initially you'll be doing almost all of it and the balance should gradually shift over the years as they get older.
At first, give out copious praise even for small acts of tidying up.
Make it a race.
Have something desirable / positive to do next, once tidying up is done. Don't let them do the fun thing until they've helped with tidying up, even if it's just one symbolic thing that they tidy eg car into box.
Sing the "Tidy Up Time" song together while you're doing it (or your local equivalent that they might get to know from nursery / kindergarten/ etc).
To the tune of Frere Jacques:
Tidy up time, tidy up time
Toys away, toys away
Everybody helping, everybody helping
Toys away, toys away
(Repeat until tidy).