This began because my Sim, Amaranth, wanted 10 kids but had lifetime aspiration of getting top of the education career, and there was no way I could make both. So I poked around and studied other age mods, and found that there wasn't a straight doubling of age, which seems rather silly to me, and a bit obvious. So I researched, explored, and fiddled until I got this one right, and trust me, it wasn't quite as simple as I was expecting. (the only life stage I didn't double was babies, mostly because I get frustrated at them waiting for their birthday as it is)

In the end, Amaranth had all her kids (thanks to twinning!) and still has half her adult life to spare.

Works best in conjunction with 5th LMNt's "Larger Households -- up to 50 family members" (here: http://modthesims.info/download.php?t=250640)mod if you're using it for the same reason I did.

When the adults reach their 30th day, I also slap the lightest of Berg's "Multi-wearable Maxis wrinkles for all ages" (here: http://modthesims.info/download.php?t=190152) on them to make them look middle-aged.



Additional Credits:
Anyone who made an age mod that I studied. Sorry I can't remember who you are, but I made this some time ago. SimPE the hair on the teenager is DJ_Mur3's OFB Mesh "Deco" for All Ages, found here: http://www.modthesims.info/download.php?t=159965, all the rest are Maxis.