Carers Allowance is currently £269 per month for 35 hours a week, which works out at roughly £1.92 per hour. National Minimum Wage for 18 year olds is currently £6.56 per hour. Carers Allowance is a taxable benefit and treated as a wage by the DWP.
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Each carer saves the economy roughly 19k a year (https://www.carersuk.org/news-and-campaigns/press-releases/facts-and-figures) but receives a wage of £3238 per year. Caring is not normally a 35 hour a week job and some are caring for multiple family members with the increased costs associated with disabilities. Anybody could become a carer at any time of life, just as anybody could become disabled. Accidents and illnesses happen.
For govt info see https://www.gov.uk/carers-allowance