I agree that adopting at 67 seems less selfish. I disagree that a 67 year old would be allowed to adopt. For example, 55 is generally the upper limit for adoption in Russia, with 45 being the limit for infants.
http://www.ftia.org/russia/legalreq.html
My point is, too often around here everyone throws out the "just adopt" card as if it's like buying a quart of milk. There are plenty of restrictions and hurdles that make that impossible in many cases.
At 67, with no husband, and planning to continue full-time work, perhaps she should just accept that she's not in a good situation to be a first-time mother, through birth or adoption.