manumission

All persons capable in law to make a valid will and testament, may grant freedom to, and effect the manumission of any slave or slaves belonging to such person or persons, by his, her or their last will and testament... provided always, that no manumission by last will and testament, shall be effectual to give freedom to any slave or slaves, if the same shall be to prejudice of creditors; nor unless the said slave or slaves shall be under the age of forty-five years, and able to work and gain a sufficient maintenance and livelihood at the time the freedom given shall commence.