We much preferred a same-age child--it's easier on logistics (naps, activities) and also on the durability of the nannyshare (if you share with an 18mo, for instance, the other family might opt for preschool in a year and then you have to find a new family, whereas if you start with two six-month-olds, it's more likely that you can align your transition to whatever comes next). My kids started shares at four and six months, respectively, so it was easy to find other families starting then too. Both kids we shared with were within a month of our own kids' ages and that worked really well for our family.
That said, we have plenty of friends who have done different-aged shares and enjoyed those too--that can be more of a sibling relationship, which is especially nice if you think this may be your only child. However, I don't know of any that lasted as long as the younger child needed care so there was an ongoing process of needing to fill the share spot when someone leaves, which can be stressful.
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