I don't think you can ever be too old to sleep with a toy. My grandmother is 79 and sleeps with a stuffed bunny. ^.^I'm a bit too old for sleeping with a toy...thou I have a plush cow laying on my bed at daytime
My both V2s sleep in their shared sleepingbag/carrycase (hand knitted from cotton string, bday present from mum ^^) on my nightstand (bedtable) next to my head so I can hear them at morning when they awake.