Hey, I feel for ya...
While I'm open to a wider age range of gals who hike, love nature, etc., the bigger issue is finding ones even halfway close to my age who are fit, have the stamina for longer and/or more challenging hikes as well as being able to tolerate heat. I hike/mountain bike year-round with no letup in the summer. In fact on busier trails I like it when it's 100+ because there's less traffic.
All you can do is keep going on hikes, eventually you might meet one as part of a group hike or maybe just by happenstance in the trail. (It may not work but it sounded good, din'cha think?) :roll: