For seniors over age 75, we often find that 10-12 lbs at most are best even if they could have more based on their body weight.
In part, this is due to a general lack of strength in this age group. Thus, moving a heavier blanket independently can be a challenge.
Being able to independently use a weighted blanket is integral to the person's ability to benefit from use. In general, if the senior needs to ask for help each time they want to use their Hippo Hug™ weighted blanked, they will usually lose their desire to use it.