Section 2-1.10. Provisions relating to infants and minors

(a)  Unless  the  creator  expressly  provides to the contrary, in any
  instrument  executed  prior  to  September   first,   nineteen   hundred
  seventy-four,   the  words  "minor",  "minority",  "infant",  "infancy",
  "majority", "adult" and words of like import shall mean or  refer  to  a
  person  or  a  class of persons under the age of twenty-one years or who
  shall have reached such age,  according  to  the  context,  and,  unless
  otherwise  expressly  provided  in  any  instrument executed on or after
  September first, nineteen hundred seventy-four shall mean or refer to  a
  person  or  a  class  of  persons under the age of eighteen years or who
  shall have reached such age, according to the context, except  that  any
  designation of a testamentary guardian of a "minor" or an "infant" shall
  refer  to  a  guardianship  of  a  person who has not reached the age of
  eighteen years, regardless of the date of the instrument containing  the
  designation.
    (b)  This  act  shall  not  apply  to distributions made subsequent to
  September  first,  nineteen  hundred  seventy-four  and  prior  to   the
  effective date of this act.