Elders

Yes, please! Although knitting would be great in a Farming EP (because wool from sheep/llamas), I would definitely buy an Elder SP that features knitting as the gameplay feature.

Knittable items:
- Clothes for sims of all ages (sweater, scarf, mittens, socks, hoodie, onesie for toddlers)
- Sweater for pets (if player owns Cats and dogs)
- Coasters for tables

I wouldn't even mind if there was only one mesh for each knitted item per age/pet, as long as there are many nice colours.
Teens and older should also be able to knit, though. I learned how to knit when I was 9.

Also:
- Rocking chair
- A few old-looking sofas and lounge chairs with pillows and embroidery

- Curtaaaains

- Cute china/knick-knacks

- Appropriate elderly clothing. Not just the quirky clothing that is actually made so young adults can also pull them off! I like @Mariefoxprice83 idea about the "senior citizen" tag, because of course the whole point of TS4 is to have everything accessible for everyone.

- Bun hairstyyyyyles
- Cranes/walking sticks

And:
- I think children should generally be able to "help with cooking" or "cook together" with older sims. But baking cookies with grandma! Yes.
- Some old-fashioned recipes like Peaches with Custard / Trifle would be so heart-warming.
- Radio station "Oldies"
- Bingo would be cute. I'd like more board-games in general.