Individual Details

Asa may not have married -- or married later to a widow with children. In 1855, he seems to be living with his brother Thomas, his wife Sarah, and the family of Thomas's son Flavel

Or, there is an Asa Danforth from Mass who dies in PA in 1869 (probate June 1869) with wife Amelia as he leaves all the estate to the poor after the death of Amelia
In 1860, his wife's name is Betsey, he is in PA but seems to have no children
With Betsey in 1850 in NY, then with Betsey in PA in 1860 but widow is Amelia in 1869

https://www.ancestry.com/interactive/8802/005537994_00651?pid=1776233&treeid=&personid=&usePUB=true&_phsrc=Gag5134&_phstart=successSource#?imageId=005537994_00651

Birth	13 Jan 1794	Tyringham, Berkshire, Massachusetts
Marriage	Abt 1840	Betsey Danforth mnu
Residence	1850	Busti, Chautauqua, New York
Marriage	Abt 1863	Amelia Danforth mnu
Death	Apr 1869	Wayne Township, Pennsylvania

Spouse

Amelia Danforth mnu (1811 - )

Spouse

Betsey Danforth mnu (1794 - 1862)

Father	Thomas Danforth (1744 - 1794)
Mother	Lydia Abbott (1748 - 1835)
Sibling	Lydia Danforth (1773 - 1794)
Sibling	Jerusha Danforth (1774 - 1817)
Sibling	Sally Danforth (1776 - 1851)
Sibling	Cyrus Danforth (1777 - 1852)
Sibling	Daniel Danforth (1779 - 1846)
Sibling	Thomas Danforth (1781 - 1861)
Sibling	Betsey Danforth (1782 - 1840)
Sibling	Dotia Danforth (1784 - 1789)
Sibling	Joel Danforth (1789 - 1854)
Sibling	Azubah Danforth (1789 - 1856)