If your 50+ year-old self needs a little motivation to start something new (or maybe restart something you gave up long ago), I give you Dr. Josefina Monasterio, and Julia Hawkins.
And Julia Hawkins started running at age 100. One. Hundred. A year later, she began competing in track and field events. (Ms. Hawkins also took up competitive cycling when she was much, much younger – at age 81.)
Need a little more inspiration? Watch this.