budgies do sometimes take to cockateils to be honest its generally in a avairy i would say itr may be a little unfair on your cockatiel to put such a young bird in with him .As the young budgie may harass the older bird maybe not aggressively but playing. But it may be too much for your older bird and your bird has been on its own for so long.It maynot take to another bird now. Could you not set up a cage next to your cocateil for some time first to see how they react together with the safty of bars between them. see how your bird is. If yours gets let out for exercise you could try them out together at least they can get away from each other and arent forced together.

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