♪ i'm going to sit right down and write myself a letter ♪ > how is your handwriting? chances are it's not as good as theirs. does our legibility get better as we get older? >> no. what happens is we tend to peak around fourth grade. so that's it. >> reporter: a primer on penmanship and whether it matters anymore later on sunday morning. >> osgood: jan's story is is a story of love and devotion in the face of a terribly sad but increasingly common condition told by our barry petersen. >> yes, you look... yeah, i'd say. i like people. >> reporter: her name is jan carleton. she has ...