We might be "softer" but 100 years ago, people lived much shorter lives, infants died at an alarming rate, and people were very uneducated.
I don't think we are all "weak". I'm a 28 year old mother of 2. I have a full time job. It's a desk job, but I worked 3 years 12 hour night shifts with an infant then toddler to get here- didn't put my daughter in daycare til she was 2, usually got 2 hours of sleep.
In less than 2 years time (2006-2008ish) I had 6 surgeries. In August 2008, I passed out, fell, and broke my leg and ankle in three places- had my husband help me up, took a shower, waited 3 hours to go to the emergency room. They finally gave me something for pain like 2 hours after I got there, then took me for surgery- had a pretty good sized rod, pins and screws in my leg- hospital two nights. I fell/had surgery Tuesday- I was back to work the following Sunday (in a wheelchair, but I was there). 3 months later, my husband and I spearated- I was still using a walker. I had to walk around downtown on a walker, trying to talk to a lawyer, domestic voilence people, courts- oh did I mention my ex is a cop and made my life liveing he**?? Ask me how many days of work I missed....1 or 2 maybe, because when I was moving out in a hurry I twisted the ankle I had broken a few months before.
So now I'm a single mom w/ 2 kids....but it's all made me stronger. And my mom is a single mom, and we all live together in her 4-bedroom house she worked for.
We're not all lazy