@Peggy and David , kia ora (I wish you both well)
Not proper for me to advise about walking alone.
As to age: I am currently 76 and you can see my credentials below.
If you do decide to have a go I strongly suggest:
1) do the physical suggested several times above
2) get lightweight gear, for example
........40 litre pack @ 600 grams
........5 degree sleeping bag @ 400 grams
........(these two items weighing just over 2 lb together)
........Minimise (keep it simple) everything else
........for example two changes plus what you wear
........Wear your (best) walking stuff if going to church
........which is what religious sisters I know tell me they do
........Good running shoes (not boots) and flip flops for evening
........Many wear a light inner sock and thicker outer sock
........(and I also wear pressure hose)
........(also see
@davebugg on feet and footwear)
........Phone (I have a tablet) with a European data plan
........Use Whatsapp (or similar) for phone calls, texts and sending photos
........Keep it simple (know where everything is)
Spain is civilised: on the
Camino Frances there are larger towns and cities every few days where you can get a need you may not have brought with you.
3) training (with all your gear) that works towards, say:
........15 km (10 miles) before stopping for breakfast
........400 m of elevation gain before stopping for breakfast
........include some steep decents in your training
The purpose is to train mind and body to cope with the variety of conditions as well as becoming appropriately fit.
If these suggestions seem extreme they are what you will encounter several times during four or more weeks and you will be able to fly through them. Maybe breakfast will be a bit earlier in reality. But do read what
@peregrina2000 has to say about early starts.
4) trial equipment and new processes at home, where you can make corections before you leave.
As for guides and manuals. Do read well.
Brierley may appeal to you for eample. I found the Michelin guide 160
Camino de Santiago was my go to during the day. It is quite light and on facing pages are:
a) elevation profile with town and villages and a selection of albergue details
b) michelin topographical map with the trail clearly marked
Kia kaha (take care, be strong, get going)