In His kindness God called you to share in His eternal glory by means of Christ Jesus. So after you have suffered a little while, He will restore, support, and strengthen you, and He will place you on a firm foundation. 1 Peter 5:10 NLT
85? I know people with relatives living up to 104 and 107... Good quality living too. Imagine 50 years from now... It is very wise to always live below your means financially. Of course living simply can incorporate certain luxuries, but hopefully you'll enjoy a better quality of life than merely living for creature comforts.
We can conserve trees by not building or living in homes larger than we truly need. Smaller homes means less wood used for framing & trim, and less heating & cooling which means less land area cleared for mining, drilling, or biomass need to generate electric. Remodel kitchens using cabinet curtains instead of hardwood cabinet doors.