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Life Expectancy in the early 1900s
57 years
Life Expectancy in 2021
82.60 years
Prenatal Development
Period from conception to birth
Infancy Age Range
0-2 years
Childhood Age Range
2 to 10-12 years
Adolescence Age Range
10-12 to 18-22 years
Early Adulthood Age Range
Late teens/early 20s to 45 years
Middle Adulthood Age Range
45-60 years
Late Adulthood Age Range
60 years to death
Trust vs Mistrust Stage
Infancy, according to Erikson's Psychological Theory
Autonomy vs Shame & Doubt Stage
Early Childhood, according to Erikson's Psychological Theory
Initiative vs Guilt Stage
Preschool age, according to Erikson's Psychological Theory
Industry vs Inferiority Stage
School age (6-12 years), according to Erikson's Psychological Theory
Identity vs Role Confusion Stage
Adolescence (12-18 years), according to Erikson's Psychological Theory
Intimacy vs Isolation Stage
Young adulthood (19-40 years), according to Erikson's Psychological Theory
Generativity vs Stagnation Stage
Middle adulthood (40-65 years), according to Erikson's Psychological Theory
Integrity vs Despair Stage
Maturity (65+ years), according to Erikson's Psychological Theory
Sensorimotor Stage
Birth to 2 years, according to Piaget's Stages of Cognitive Development
Preoperational Stage
2-7 years, according to Piaget's Stages of Cognitive Development
Concrete Operational Stage
7-11 years, according to Piaget's Stages of Cognitive Development
Formal Operational Stage
11+ years, according to Piaget's Stages of Cognitive Development
Simple Reflexes Substage
First month of sensorimotor stage
Primary Circular Reactions Substage
1-4 months of sensorimotor stage
Secondary Circular Reactions Substage
4-8 months of sensorimotor stage
Coordination of Secondary Circular Reactions Substage
8-12 months of sensorimotor stage
Tertiary Circular Reactions Substage
12-18 months of sensorimotor stage
Beginnings of Thought Substage
18-24 months of sensorimotor stage
Number of Genes in Cell Nucleus
25,000 genes
Chromosome Pairs in Humans
23 pairs, totaling 46 chromosomes
Genes from Mitochondria
37 genes inherited from the mother
Cystic Fibrosis Occurrence
1 in 2,000 births
PKU Occurrence
1 in 10,000 to 1 in 20,000 births
Chance of Child Developing with PKU
1/4 chance if both parents have the gene